body {
  margin: 0;
  background: linear-gradient(135deg, #76ab6a, #ffffff, #76ab6a);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  min-height: 100vh;
  padding: 20px;
  color: #333;
}

#app {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
}

* {
  box-sizing: border-box;
}

/* 动画优化 */
.card-drop-enter-active, .card-drop-leave-active {
  transition: transform 0.5s;
}
.card-drop-enter-from, .card-drop-leave-to {
  transform: translateY(-50px);
}

.fade-enter-active,
.fade-leave-active {
  transition: opacity 0.3s;
}

.fade-enter-from,
.fade-leave-to {
  opacity: 0;
}